Cairo, Zawiyat al-Abbar

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 10°.
• Contains one regular 9-pointed star polygon with vertex angle of 110°.
• Contains one regular 12-pointed star polygon with vertex angle of 100°.
• There are four non-regular reflective tiles.
• The tiling satisfies the interlace condition and has two finite interlaces and one infinite interlace.
• The tiling is edge-to-edge.
• As drawn, contains about 518 polygons.

• Vol 2, Plate 61c (Cairo, Zawiyat al-Abbar, Dated 1283) from [creswell]
• Vol 2, Plate 112c (Madrasa-mausoleum of Salar & Sangar al-Gawli, mihrab in courtyard) from [creswell]
• Vol 2, Plate 116e (Khanqa al-Bunduqdariya, 2nd mausoleum) from [creswell]
• Vol 2, Plate 98b (Khanqa of Baybars al-Gashankir) from [creswell]

• Wade photo IRA 0611

• Tilings not constructible by straightedge and compass

v22